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/**
* Credit to https://ped.ro/writing/code-blocks-but-better
*/
import rangeParser from 'parse-numeric-range'
import { visit } from 'unist-util-visit'
import { toString } from 'hast-util-to-string'
import { refractor } from 'refractor'
import tsx from 'refractor/lang/tsx'
import jsx from 'refractor/lang/jsx'
import highlightLine from './rehype-highlight-line.js'
import highlightWord from './rehype-highlight-word.js'
export default () => {
refractor.register(tsx)
refractor.register(jsx)
return tree => {
visit(tree, 'element', visitor)
}
function visitor(node, index, parentNode) {
if (parentNode.tagName === 'pre' && node.tagName === 'code') {
// syntax highlight
const lang = node.properties.className
? node.properties.className[0].split('-')[1]
: 'md'
const data = toString(node)
let result = refractor.highlight(data, lang)
const linesToHighlight = [0]
// line highlight
if (node.data?.meta) {
node.data.meta.split(' ').forEach(bit => {
if (bit.includes('line')) {
const [_, lineRange] = bit.split('=')
linesToHighlight.push(...rangeParser(lineRange || '0'))
}
if (bit.includes('live')) {
parentNode.properties.code = data
}
})
}
result = highlightLine(result, linesToHighlight)
// word highlight
result = highlightWord(result)
node.children = result
}
}
}
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